EP2344921B1 - Système de commutation de polarisation conservant une étendue optique et procédés apparentés - Google Patents

Système de commutation de polarisation conservant une étendue optique et procédés apparentés Download PDF

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Publication number
EP2344921B1
EP2344921B1 EP09744807.0A EP09744807A EP2344921B1 EP 2344921 B1 EP2344921 B1 EP 2344921B1 EP 09744807 A EP09744807 A EP 09744807A EP 2344921 B1 EP2344921 B1 EP 2344921B1
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EP
European Patent Office
Prior art keywords
polarization
light
light path
reflective element
etendue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP09744807.0A
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German (de)
English (en)
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EP2344921A1 (fr
Inventor
Barry David Silverstein
Joseph Raymond Bietry
Robert Metzger
Gary Edwin Nothhard
Richard P. Corey
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Imax Theatres International Ltd
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Imax Theatres Internat Ltd
Imax Theatres International Ltd
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Publication of EP2344921A1 publication Critical patent/EP2344921A1/fr
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Publication of EP2344921B1 publication Critical patent/EP2344921B1/fr
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
    • G02B19/0057—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode in the form of a laser diode array, e.g. laser diode bar
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/143—Beam splitting or combining systems operating by reflection only using macroscopically faceted or segmented reflective surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/147—Beam splitting or combining systems operating by reflection only using averaging effects by spatially variable reflectivity on a microscopic level, e.g. polka dots, chequered or discontinuous patterns, or rapidly moving surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3167—Modulator illumination systems for polarizing the light beam

Definitions

  • the present invention relates to optical systems that maintain etendue.
  • An existing optical system 45 is described with respect to FIG 1 .
  • system 45 light from one or more substantially polarized solid state light sources 44a, 44b are combined by beam combiners 30.
  • the combined light from sources 44a is subsequently rotated by retardation plate 64 such that its polarization is orthogonal to the combined light from sources 44b.
  • the orthogonally polarized combined light from sources 44a and 44b next impinge upon rotating disk 65, which contains at least one segment that is transmissive and one that is reflective to the light.
  • the combined light from sources 44a will be directly reflected onto the optical axis 3 and directed toward lens 50 for either optical integration (not shown) or illumination of the remaining optical system (not shown).
  • the combined light from sources 44b will be redirected to reflective surface 72 and further passed through retardation plate 64, which rotates the polarization to substantially the same state as the combined light from sources 44a.
  • the light exiting retardation plate 64 is substantially directed onto a similar optical path of the combined light from sources 44a and is sent through lens 50.
  • disk 65 is rotated such that the transmissive segment is in the path of the combined light from sources 44a and 44b
  • the situation is reversed such that the combined light from sources 44a is redirected and rotated to the polarization state of the combined light from sources 44b before both are sent to lens 50.
  • the rotating segmented disk 65 alternately delivers two orthogonal states of polarization to lens 50 for use in an optical system.
  • JP 2002 35 063 A teaches a method for drilling a printed board. The method involves setting an energy density of a first UV laser beam to a higher energy level than a first threshold value necessary to decompose a conductor layer, and drilling a hole up to an insulating layer. An energy density of a second UV laser beam is set to a value lower than the first threshold value but higher than a second threshold value necessary to decompose the insulating layer and drilling through the insulating layer to expose an object conductor layer.
  • an etendue maintaining polarization switching system as set forth in claims 1 and 6 is provided. Further embodiments of the invention are inter alia claimed in the dependent claims.
  • an etendue maintaining polarization switching system inter alia includes a laser illumination system providing polarized light along a first light path.
  • the system also includes a pivoted reflective element disposed in the first light path that alternatively directs the polarized light in the first light path; without changing its polarization, along at least a second light path and a third light path under the control of a rotation device and a driving device.
  • a retarder disposed in the second light path changes the polarized light into light having a different polarization along the second light path.
  • a reflective element is disposed in the third light path upstream of the polarization combining device.
  • a polarization combining device combines light from the third light path with the light having the different polarization from the retarder in the second light path into a single light beam exhibiting a same or substantially a same etendue as the first light path.
  • a rotation device and a driving device collectively cause the pivoting of the pivoted reflective element.
  • the driving device provides the rotation device with a driving signal, the driving signal causing the rotation device to pivot the pivoted reflective element.
  • the driving signal is configured to include noise, whether random or otherwise. Such noise may be configured to reduce speckle.
  • the pivoted reflective element includes an optical surface that slightly deforms when the rotation device and the driving device move the reflective element. Such deformation may occur due to acceleration, deceleration, or both, when the reflective element is moved by the rotation device and the driving device. Such a deforming optical surface may be configured to reduce speckle in addition to or in lieu of the use of noise to reduce speckle.
  • Some embodiments of the present invention include a reflective retarding system disposed in the third light path as opposed to a retarder in the second light path used in some other embodiments.
  • the reflective retarding system changes the polarized light into light having a different polarization and reflects the light having the different polarization along the third light path.
  • any of the etendue maintaining polarization switching systems according to the present invention may be included in a projection system.
  • a projection system may or may not be a stereoscopic projecting system configured to generate stereoscopic images.
  • the projection system includes optics supporting the etendue maintaining polarization switching system and a projection assembly.
  • Various embodiments of the present invention pertain to polarization switching while maintaining etendue.
  • the polarization switching occurs with a mirror that quickly transitions between two positions. Light having uniform polarization is transmitted to the mirror. Light reflected off of the mirror in one of the two positions has its polarization changed, whereas light reflected off of the mirror in the other of the two positions has its polarization maintained. Thereafter, the polarization-changed light and the polarization-maintained light easily may be recombined in an optice-maintaining manner. Because the recombined light includes two different polarization states, stereoscopic images may be generated.
  • FIG. 2 illustrates an etendue maintaining polarization switching system 47, according to an embodiment of the present invention.
  • the system 47 includes a laser illumination system 27 that contains one or more laser sources directing polarized light along a first light path 28 to a pivoted mirror 49.
  • illumination system 27 contains one or more laser sources directing polarized light along a first light path 28 to a pivoted mirror 49.
  • illumination system 27 contains one or more laser sources directing polarized light along a first light path 28 to a pivoted mirror 49.
  • illumination system 27 any low angular divergence (under approximately 10 degrees) substantially polarized light source may be used.
  • Pivoted mirror 49 may be any type of pivoted reflective element, such as a common mirror, a wavelength tuned mirror, or a thin film, wire grid, or other type of polarization beamsplitter.
  • a polarization beamsplitter may be advantaged in that this surface can effectively be used to enhance the polarization ratio of the laser sources.
  • Common laser sources emit polarization ratios of approximately 100:1. If a higher extinction is desired, a polarization beamsplitter my be used to transmit the leakage polarization state, while reflecting nearly all of the higher ratio polarized light.
  • Mirror 49 may be mounted to a rotation device 63, which may be, for example, a galvanometer such as that provided by Cambridge Technologies Inc, Lexington, MA., a pivot devise driven by a cam gear on a motor, a pivot bearing driven by voice coil, piezo-electric motor or other linear or rotary motor.
  • the rotation device 63 may be driven by a driving device 62 that provides, for example, electric current to cause a motor in the rotation device 63 to operate and, thus, move the mirror 49.
  • a primary purpose of rotation device 63 is to cause the mirror 49 to be rotated about a pivot point 58 to two or more substantially fixed positions (e.g., a(t1), b(t2)) with a minimal transition time (delta t) between the fixed positions.
  • mirror position a(t1) at time t1 directs the polarized light beam to a second light path (a) containing optical retarder 64 and subsequently polarization beamsplitter 57.
  • the optical retarder 64 is configured to change the polarization of the polarized light from the laser illumination system 27.
  • optical retarder 64 would provide substantially a half wave rotation.
  • Polarization beamsplitter 57 is an example of a polarization combining device that is designed to transmit the light having the different polarization (e.g., the orthogonal polarization) from the retarder 64.
  • polarization beamsplitter 57 or any other polarization combining device used in its place may instead be designed to reflect the light having the different polarization (e.g., the orthogonal polarization) instead.
  • the mirror 53 discussed below, may instead be a device that causes a half-wave rotation in the light along path (b).
  • rotation device 63 transitions mirror 49 during minimized time delta t to position b(t2).
  • the rotation device 63 may be driven either by electronic command or motor timing.
  • the mirror 49 redirects the light from laser illumination system 27 to a third light path (b).
  • the light along path (b) travels to a mirror 53.
  • the mirror 53 can be a conventional mirror, tuned mirror or polarization beamsplitter, just like mirror 49.
  • Mirror 53 directs the laser light to polarization beamsplitter 57 to be combined into the same or substantially the same optical path as the laser light from paths 28 and (a).
  • the combined light beam from beamsplitter 57 exhibits an etendue that is the same or is substantially the same as the etendue exhibited by light along paths 28 and (a).
  • the combined angles from the repositioned mirror 49 from (a) to (b) along with the angular position of mirror 53 direct the laser light via reflection such that upon reflection off of beamsplitter 57 the light beams of path (a) and path (b) substantially coincide in both an angular and spatial sense.
  • the path lengths may be a desire, however, to keep the path lengths short such that the small laser divergence does not cause a significant size difference between the two optical paths, as they are unequal. In this case, the system etendue is substantially preserved.
  • polarization beamsplitter will deliver one polarization state at (t1) and an orthogonal polarization state at (t2) to an optical system that will substantially maintain these polarization states to the viewer.
  • the viewer discriminates between the different images shown at (t1) and (t2) by orthogonal polarizing filters over each eye. It is desirable to minimize the transition time delta t in order to decrease either crosstalk of polarization states where the wrong image signal is sent to the opposing eye.
  • a blanked image no image is used during the transition time
  • FIG. 3 illustrates an etendue maintaining polarization switching system 48, according to an embodiment of the present invention.
  • the system 48 is similar to the system 47 illustrated by FIG. 2 , except that the system 48 does not include the optical retarder 64 in FIG. 2 , and the mirror 53 in FIG. 2 is replaced by a reflective retarding system 55 that both reflects and rotates the polarization state of the light.
  • the reflective retarding system 55 may be a single reflective retarder (as shown in FIG. 3 ), known in the art, may be a reflector and a retarder in series (not shown in FIG. 3 ), or may be any other equivalent device or combination of devices.
  • the polarization beamsplitter 57b transmits the original laser polarization state and reflects the rotated polarization state from path (b). It should be noted that, if etendue maintenance is not a concern, the mirror 53 may be tilted in such a way, not shown, that downstream portion of path (b) is reflected in a direction parallel to path (a).
  • FIG. 4 illustrates a projection system 100 incorporating etendue maintaining polarization switching systems 47 (47r, 47g, 47b) of FIG. 2 for each color channel (red, green, blue, respectively, for example), according to an embodiment of the present invention.
  • system 100 is shown using systems 47 of FIG. 2 , one skilled in the art will appreciate that the system 100 may instead include systems 48 of FIG. 3 or systems from other embodiments of the present invention.
  • FIG. 4 involves red, green, and blue color channels, one skilled in the art will appreciate that different numbers and types of color channels may be used.
  • each switching system 47r, 47g, 47b Associated with each switching system 47r, 47g, 47b, are supporting optics 51r, 51g, 51b, respectively.
  • Each set of supporting optics 51 includes an integrating bar 52, a spatial light modulator 60, and various lenses 54 configured to couple the light into integrating bar 52 and subsequently resize and image the uniformized illumination exiting the integrating bar onto spatial light modulator 60.
  • the colored light from switching systems 47r, 47g, 47b and supporting optics 51r, 51g, 51b, respectively, are combined with dichroic plates 84, known in the art.
  • the combined light from dichroic plates 84 are projected by a projection assembly 70, which includes several lenses in a configuration known in the art.
  • FIG. 5 illustrates intentionally caused vibrations in angular position of a rotating mirror, according to embodiments of the present invention.
  • mirror 49 may be caused to vibrate in order to reduce laser speckle, known in the art.
  • FIG. 5 shows that rotational device 63 may be driven by a randomly noisy input signal (as opposed to the "clean input signal” shown in FIG. 5 ) from driving device 62 that causes slight angular motion of mirror 49. This slight angular motion is illustrated by the graph of "Angular Position per Random Noise Signal" in FIG. 5 .
  • the noise applied by the driving device 62 to the signal driving the rotational device 63 need not be purely random, however. For example, ordered noise may be provided to the rotation device 63 by the driving device 62.
  • Intentional angular noise or vibration can be utilized to provide small temporal shifts of the laser illumination beams to the spatial light modulator, thereby causing reduced laser speckle.
  • a desirable frequency domain would be such that the speckle patterns would be averaged over different positions by the eye.
  • the mirror 49 may be fabricated or mounted in a manner that would slightly deform the optical surface of the mirror 49 when it moves to cause small optical path differences in the illumination path. In other words, causing slight deformations in the optical surface of the mirror 49 when it moves will cause or facilitate vibrations in light reflected off of the mirror 49 in order to reduce laser speckle. Again the frequency domain of this vibration would be tuned such that the eye averages out the variation in speckle patterns to reduce the viewable speckle intensities.
  • the acts of acceleration and deceleration of the mirror 49, when it transitions from one position to another see FIG.
  • ringing may be a desirable attribute as a means of speckle reduction.
  • the mirror may contain a diffusive surface in order to further enhance laser speckle reduction.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)
  • Polarising Elements (AREA)

Claims (10)

  1. Système de commutation de polarisation conservant une étendue pour commuter alternativement la polarisation d'un faisceau lumineux entrant, comprenant :
    un système d'éclairage laser (27) agencé pour fournir le faisceau lumineux entrant comportant de la lumière polarisée avec une étendue d'entrée associée suivant un premier chemin de lumière (28) ;
    un élément réfléchissant pivotant (49) disposé dans le premier chemin de lumière, l'élément réfléchissant pivotant étant actionnable dans le temps pour diriger de façon contrôlable et alternée le faisceau lumineux entrant suivant au moins un deuxième chemin de lumière (a) et un troisième chemin de lumière (b) ;
    un retardateur (64) disposé dans le deuxième chemin de lumière, le retardateur étant agencé pour modifier la polarisation de la lumière dans le deuxième chemin de lumière pour obtenir de la lumière ayant une polarisation différente ; et
    un dispositif de combinaison de polarisation (57) agencé pour diriger la lumière provenant du troisième chemin de lumière et la lumière ayant la polarisation différente dans le deuxième chemin de lumière pour obtenir un faisceau lumineux à polarisation commutée sur un chemin de lumière commun, le faisceau lumineux à polarisation commutée présentant une étendue identique ou sensiblement identique à l'étendue d'entrée associée au faisceau lumineux entrant et ayant un état de polarisation qui dépend de la position de l'élément réfléchissant pivotant ;
    le système de commutation de polarisation conservant une étendue étant caractérisé en ce qu'il comprend en outre
    un dispositif de rotation (63) et un dispositif d'entraînement (62) agencés collectivement pour faire pivoter l'élément réfléchissant pivotant, le dispositif d'entraînement étant agencé pour fournir au dispositif de rotation un signal de commande agencé pour faire en sorte que le dispositif de rotation fasse pivoter l'élément réfléchissant pivotant, le signal de commande étant agencé pour inclure un signal de bruit, et l'élément réfléchissant pivotant comprenant une surface optique agencée pour se déformer légèrement en réponse au signal de bruit lorsque le dispositif de rotation et le dispositif d'entraînement font pivoter l'élément réfléchissant pivotant, produisant par cela des différences de chemin optique correspondantes pour réduire la granularité du laser.
  2. Système selon la revendication 1, dans lequel le signal de bruit est aléatoire.
  3. Système selon la revendication 1, dans lequel le signal de bruit est ordonné.
  4. Système selon la revendication 1, dans lequel la surface optique est agencée pour se déformer légèrement en raison d'une accélération, d'une décélération, ou des deux, lorsque l'élément réfléchissant est déplacé par le dispositif de rotation et le dispositif d'entraînement.
  5. Système selon la revendication 1, comprenant en outre un élément réfléchissant (53) disposé dans le troisième chemin de lumière en amont du dispositif de combinaison de polarisation.
  6. Système de commutation de polarisation conservant une étendue pour commuter alternativement la polarisation d'un faisceau lumineux entrant, comprenant :
    un système d'éclairage laser (27) agencé pour fournir le faisceau lumineux entrant comportant de la lumière polarisée avec une étendue d'entrée associée suivant un premier chemin de lumière (28) ;
    un élément réfléchissant pivotant (49) disposé dans le premier chemin de lumière, l'élément réfléchissant pivotant étant actionnable dans le temps pour diriger de façon contrôlable et alternée le faisceau lumineux entrant suivant au moins un deuxième chemin de lumière (a) et un troisième chemin de lumière (b) ;
    un dispositif de rotation (63) et un dispositif d'entraînement (62) agencés collectivement pour faire pivoter l'élément réfléchissant pivotant, le dispositif d'entraînement étant agencé pour fournir au dispositif de rotation un signal de commande agencé pour faire en sorte que le dispositif de rotation fasse pivoter l'élément réfléchissant pivotant, le signal de commande étant agencé pour inclure un signal de bruit, et l'élément réfléchissant pivotant comprenant une surface optique agencée pour se déformer légèrement en réponse au signal de bruit lorsque le dispositif de rotation et le dispositif d'entraînement font pivoter l'élément réfléchissant pivotant, produisant par cela des différences de chemin optique correspondantes pour réduire la granularité du laser ;
    - un système de retardement réfléchissant (55) disposé dans le troisième chemin de lumière agencé pour modifier la polarisation de la lumière dans le deuxième chemin de lumière pour obtenir de la lumière ayant une polarisation différente et pour réfléchir la lumière ayant la polarisation différente suivant le troisième chemin de lumière ; et
    un dispositif de combinaison de polarisation (57b) agencé pour diriger la lumière provenant du deuxième chemin de lumière et la lumière ayant la polarisation différente dans le troisième chemin de lumière pour obtenir un faisceau lumineux à polarisation commutée sur un chemin de lumière commun, le faisceau lumineux à polarisation commutée présentant une étendue identique ou sensiblement identique à l'étendue d'entrée associée au faisceau lumineux entrant et ayant un état de polarisation qui dépend de la position de l'élément réfléchissant pivotant.
  7. Système selon la revendication 6, dans lequel le système de retardement réfléchissant comprend un retardateur réfléchissant.
  8. Système selon la revendication 6, dans lequel le système de retardement réfléchissant comprend un réflecteur et un retardateur en série.
  9. Système de projection comprenant :
    le système de commutation de polarisation conservant une étendue de la revendication 1 ;
    des éléments optiques supportant le système de commutation de polarisation conservant une étendue ; et
    un ensemble de projection.
  10. Système de projection comprenant :
    le système de commutation de polarisation conservant une étendue de la revendication 6 ;
    des éléments optiques supportant le système de commutation de polarisation conservant une étendue ; et
    un ensemble de projection.
EP09744807.0A 2008-10-28 2009-10-23 Système de commutation de polarisation conservant une étendue optique et procédés apparentés Not-in-force EP2344921B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/259,307 US8016422B2 (en) 2008-10-28 2008-10-28 Etendue maintaining polarization switching system and related methods
PCT/US2009/005788 WO2010051017A1 (fr) 2008-10-28 2009-10-23 Système de commutation de polarisation conservant une étendue optique et procédés apparentés

Publications (2)

Publication Number Publication Date
EP2344921A1 EP2344921A1 (fr) 2011-07-20
EP2344921B1 true EP2344921B1 (fr) 2016-09-28

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US (2) US8016422B2 (fr)
EP (1) EP2344921B1 (fr)
JP (1) JP5631323B2 (fr)
TW (1) TWI468736B (fr)
WO (1) WO2010051017A1 (fr)

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US20110279779A1 (en) 2011-11-17
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TW201022726A (en) 2010-06-16
JP2012507042A (ja) 2012-03-22
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US8016422B2 (en) 2011-09-13
US20100103519A1 (en) 2010-04-29

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